Frozen Value Alarm State

I’m looking for a easy way to trigger an alarm based on if a values remains the same for a specified period of time. For an example, I am bringing in some tank levels into my system, however, there are times when the equipment might malfunction and the tank readings get stuck. Is there an alarm type that would support this type of behavior, i.e. if my tank level stays the same for 2 hours, trigger an alarm?

Use the hasChanged expression:


This is exactly what i needed!

Thank you.